Selection policies for queued new calls in cluster-based micro/picocellular wireless networks

Micro/picocellular architectures for wireless networks have been proposed to provide higher capacity under limited radio spectrum. With smaller cell size, the frequency of hand-off events will increase. This will in turn increase the overheads for processing hand-off events. To reduce the overheads due to frequent hand-off, a cell-cluster concept has been proposed previously. In this paper, we considered cluster-based micro/picocellular wireless networks with new call queueing. Two selection policies, namely, random and maximum-free-channels policies, were proposed for selection of queued new calls. The selection policy is part of the call admission policy. The performance of the selection policies were studied by extensive simulations. Our results show that the maximum-free-channels policy has significantly better performance (in terms of hand-off dropping probability) than the random policy when the average number of occupied channels in a cluster is greater than the admission threshold